A fire door is a type of door or movable barrier used as part of a passive fire protection system within buildings to prevent the spread of fire or smoke between separate sections. It is usually the only means of allowing people to pass through a fire resistant wall.
Keywordsdoor, smoke, fire, barrier, fire door, passive fire protection, fire resistant wall, flame retardant
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Government Printing Office The Official Gazette of the United States Patent Office (Washington, DC: Government Printing Office, 1895)